Electric heating – Heating devices – With heating unit structure
Patent
1975-03-17
1976-07-20
Mayewsky, Volodymyr Y.
Electric heating
Heating devices
With heating unit structure
219544, 338241, H05B 308, H05B 352
Patent
active
039708225
ABSTRACT:
An electric cartridge heater having a metallic tubular metal sheath with an elongate heating element of generally circular cross section therein, the heating element being substantially coaxial with the sheath with an annular space between the sheath and the heating element. Particulate electrical insulating material, such as magnesium oxide (MgO), fills the annular space providing a conductive heat transfer path between the heating element and the sheath and electrically insulating the heating element from the sheath. The sheath, with the heating element in place and with the particulate insulating material surrounding the heating element in the sheath, is compressed by a diameter reduction process (e.g., swaging) thereby to compress the particulate insulative material and the heating element. The heating element is of crushable construction and has a substantially uniform diameter intermediate its ends and its ends are of a smaller diameter than its intermediate portions so that upon the heater being compressed and crushed during swaging, a layer of the particulate insulating material of substantially uniform thickness is formed along the length of the heating element between the heating element and the sheath. A method of assembling the above-described cartridge heater is also disclosed.
REFERENCES:
patent: 2831951 (1958-04-01), Desloge
patent: 3080543 (1963-03-01), Boggs
patent: 3217279 (1965-11-01), Boggs
patent: 3310769 (1967-03-01), Simmons
patent: 3582616 (1971-06-01), Wrab
patent: 3812580 (1974-05-01), Drugmand
patent: 3839623 (1974-10-01), Portmann
Mayewsky Volodymyr Y.
Watlow Electric Manufacturing Company
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